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Search Results: 1 - 10 of 480 matches for " Vyacheslav Tuzlukov "
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Signal Processing by Generalized Receiver in DS-CDMA Wireless Communication Systems with Optimal Combining and Partial Cancellation
Vyacheslav Tuzlukov
EURASIP Journal on Advances in Signal Processing , 2011, DOI: 10.1155/2011/913189
Abstract:
Combined Radio Resource Management for 3GPP LTE Networks
Modar Safir Shbat,Vyacheslav Tuzlukov
Advances in Mathematical and Computational Methods , 2011, DOI: 10.5729
Abstract: An intelligent radio resource management (RRM) is the core system of LTE network inorder to provide the broadband mobility needs of upcoming years. RRM system will schedule theavailable radio resources in a best way, so all the users will be served by enough transmission capabilityand required level of QoS and mobility, and also RRM system will assure that the assignedresources would not interfere with any previous assigned resources. Using aggressive frequencyreuse (factor of 1) in LTE network means that the whole frequency spectrum will be available insingle eNodeB which creates large effect of inter cell interference (ICI) especially at the edge of thecell. The development of Self Organizing Network (SON) techniques, algorithms and eventuallystandards is a critical step in LTE femtocell deployments and a great confirmation about the importanceof RRM. In this paper different radio resource scheduling algorithms and ICI eliminationtechniques will be analyzed, and a vision of RRM scheme will be presented based on fulfilling thesuggested requirements from RRM system.
Role of the mental foramens in dolphin hearing  [PDF]
Vyacheslav Ryabov
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.26081
Abstract: The role of mental foramens in dolphin hearing was studied in the present work. To this effect the mental foramens’ morphology features which are essential from acoustical viewpoint have been studied. The patterns of relationship between the location of mental foramens and their sizes are found. The affinity of the mental foramens’ morphology and acoustics that the nature had created testify acoustical expediency of the mental foramens’ architecture. This natural inference in the main is confirmed in this work by the experimental data. The mean values of detection thresholds of short broadband stimuli with spectral maximum on frequencies 8, 16, 30 and 100 kHz at acoustical shielding the mental foramens increased on 30, 34, 40 and 50 dB, respectively. Results obtained testify that the mental foramens are the unique sound-conducting pathway into the fat body of the mandibular canal for the sounds of all frequencies used in the experiment, approximately 6?150 kHz (in view of stimuli broadbandness). The left and right row of the mental foramens together with respective mandibular canal plays the role of pinna and external auditory meatus if to use conventional terminology of a land mammal ear. But it is already qualitatively the new external ear implemented by the nature as the receive array and acoustical horn. The new external ear has apparently appeared in result of the dolphins’ ancestors’ adaptation to new environment conditions, as evolutionary adaptation of the ear to the water and as functional adaptation of the ear in order that to fulfill the new more sophisticated functions in the structure of sonar. The findings give good reason to suppose existence of the same external ear in Odontoceti.
Some Aspects of Analysis of Dolphins’ Acoustical Signals  [PDF]
Vyacheslav Ryabov
Open Journal of Acoustics (OJA) , 2011, DOI: 10.4236/oja.2011.12006
Abstract: Dolphins produce various types of sounds in a wide range of frequencies. Characteristics of some sounds till now have not been correctly registered, that influenced on interpretation of their functions. Studying of the characteristics and functions of dolphins’ acoustical signals is the purpose of the present work. In this work the acoustical signals of two dolphins (Tursiops truncatus) were registered by two-channel system in the frequencies band up to 200 kHz at quasi-stationary position of the dolphins. The dolphins along with whistles are producing the packs of coherent and non-coherent broadband pulses. The waveform and spectrum of coherent pulses was invariable within a pack, but considerably varies from a pack to a pack. The waveform of each non-coherent pulse vary from a pulse to a pulse in each pack, therefore their spectrum also vary from a pulse to a pulse and have many extremums in the band of 6 - 200 kHz. It is very likely that the non-coherent pulses play a part of phonemes of a dolphin spoken language and the probing signals of dolphin’s non- coherent sonar. The use possibility of the signals by dolphins for communication and orientation was considered, as the signals apparently are bimodal. Results of the work have significance for further studying of the dolphin’s sonar and spoken language.
Blast Waves in Multi-Component Medium with Thermal Relaxation  [PDF]
Vyacheslav O. Vakhnenko
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.612096
Abstract:

The mathematical models of relaxing media with a structure for describing nonlinear long-wave processes are explored. The wave processes in non-equilibrium heterogeneous media are studied in terms of the suggested asymptotic averaged model. On the microstructure level of the medium, the dynamical behavior is governed only by the laws of thermodynamics, while, on the macrolevel, the motion of the medium can be described by the wave-dynamical laws. It is proved rigorously that on the acoustic level, the propagation of long waves can be properly described only in terms of dispersive dissipative properties of the medium, and in this case, the dynamical behavior of the medium can be modeled by a homogeneous relaxing medium. At the same time, the dynamical behavior of the medium cannot be modeled by a homogeneous medium even for long waves, if they are nonlinear. For a finite-amplitude wave, the structure of medium produces nonlinear effects even if the individual components of the medium are described by a linear law. The heterogeneity of the structure of medium always introduces additional nonlinearity. It is shown that the solution of many problems for multi-component media with incompressible phases can be obtained through the known solution of a similar problem for a homogeneous compressible medium by means of the suggested transformation. It is not necessary to solve directly the problem for the medium with incompressible component, and it is sufficient just to transform the known solution of the similar problem for a homogeneous medium. The scope for the suggested transformation is demonstrated by the reference to the strong explosion state in a two-phase medium. The special attention is focused on the research of blast waves in multi-component media with thermal relaxation. The dependence of the shock damping parameters on the thermal relaxation time is analyzed in order to provide a deeper understanding of the damping of shock waves in such media and to determine their effectiveness as localizing media. This problem attracts the interest also in view of the practical possibility to estimate the efficiency of medium for damping the shock wave action. To find the nature of the relaxation interaction between the components of medium and to estimate the attenuation of shock waves generated by solid explosives, we have studied experimentally both the velocity field of shock waves and the pressure at front in an air foam. The comparison of experimental and theoretical investigations of the relaxation phenomena which accompany the

Solar radiation and atmospheric dynamics  [PDF]
Vyacheslav M. Somsikov
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.62007
Abstract:

This paper studies the problems of mathematical description of physical processes in open non-equilibrium atmosphere. It is proposed that the mathematical description should be based on the idea that properties of an open system are determined by the properties of its elements and external constraints. It is also explained why atmosphere should be represented by an open non-equilibrium system of gas and radiation. Difference between physical processes in the above mentioned system and equilibrium atmosphere is given. The modification of equations of non-equilibrium thermodynamics for a system of gas and radiation is proposed. Possible ways for further development of tools of non-equilibrium thermodynamics are considered.

A dynamical inverse problem for a parabolic equation
Vyacheslav Maksimov
Opuscula Mathematica , 2006,
Abstract: A problem of dynamical reconstruction of unknown distributed or boundary disturbances acting upon nonlinear parabolic equations is discussed. A regularized algorithm which allows us to reconstruct disturbances synchro with the process under consideration is designed. This algorithm is stable with respect to informational noises and computational errors.
Recovering a part of potential by partial information on spectra of boundary problems
Vyacheslav Pivovarchik
Opuscula Mathematica , 2005,
Abstract: Under additional conditions uniqueness of the solution is proved for the following problem. Given 1) the spectrum of the Dirichlet problem for the Sturm–Liouville equation on $[0,a]$ with real potential $q(x) \in L^2(0,a)$, 2) a certain part of the spectrum of the Dirichlet problem for the same equation on $[\frac{a}{3},a]$ and 3) the potential on $[0,\frac{a}{3}]$. The aim is to find the potential on $[\frac{a}{3},a]$.
Receptions of resolution of conflicts in scientific creativity
Vyacheslav Ytyomov
Koncept : Scientific and Methodological e-magazine , 2013,
Abstract: In article the work technique with receptions of resolution of conflicts is described. To be considered a complex of receptions of resolution of conflicts of G. S. Altshuller and to be brought system of exercises of training in resolution of conflicts.
Poetics of Urban Environment Поэтика городской среды
Vyacheslav Glazychev
Project Baikal , 2007,
Abstract: Environment is assumed as both object-space surroundings in their sensibly given components, and surroundings of a human being in particularly social sense revealed in observed signs of distribution of roles and positions. When focusing on the first interpretation we face mostly the still life vision of the city. Here the city is equated to a landscape, for example in English terminology the word 'townscape' has this very fixed meaning. In the traditional art history estimation the townscape is easily analyzed both as a whole and elementarily. When focusing on the second interpretation the surroundings are usually intensively broken down into their constituent parts: Gogol's Nevsky Avenue is a poetically shaped social-psychological section of the street, almost absolutely free of its topographic definiteness. The general bivalence of the word 'environment' will not be an obstacle here, but on the contrary we will consider this very bivalence as an essential characteristic of the subject. How to research this subject with indistinct frames and eluding shape, if ambivalence is its essence? This task was perfectly carried out by Italo Calvino, a writer, his Invisible Cities are the broadest typology of all conceivable urban environments, a collection of their poetic 'models'. The urban environment – a dense clot of spontaneous impressions and respective mental constructions – cannot be researched in vitro, whereas it could be in the past and it can be now successfully studied by art. This wonderful ability of art, abstractedly from live concreteness of urban environment, may be expressed just by means of free art history interpretation, which is not strictly bounded by the rule of unity of object and language, time and place. When and under which conditions does the urban environment act as an object of aesthetic experience and understanding? What metamorphoses does the aesthetic development of urban environment experience depending on the place and historical time? And finally, what is the peculiarity of the today's treatment of the urban environment? It is obvious, that if to gather all the above questions into summarizing one, it will be a question on formation and development of the urban environment as an object of art activity and aesthetic perception. This is not only a question of studying, but rather of understanding of urban environment as totally humanized natura naturata, developed within thousands of years.
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